Hard for me to understand your question. High School physics. Speed = distance/time. If you want MPH, measure distance in feet, time in seconds then use 60 mph = 88 ft/second. In simple terms, divide speed by 88 then multiply by 60.
Has nothing to do with rear tire size unless you have a tractor like my jubilee and you change tire size.
The tach on my Old Jubilee, shows speed in each gear for any engine RPM.
Too early for me to understand the rest of your question.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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